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QUESTION
I am trying to implement a Monad interface in Java 8 following this article however I've got the following compiling errors
2 errors found:
File:FunctorsMonads.java [line: 36]
Error: FOptional is not abstract and does not override abstract method flatMap(java.util.function.Function>) in Monad
File:FunctorsMonads.java [line: 50]
Error: name clash: flatMap(java.util.function.Function>) in FOptional and flatMap(java.util.function.Function) in Monad have the same erasure, yet neither overrides the other
The Functor
interface works just fine. Any help is much appreciated.
Here is the code:
...ANSWER
Answered 2019-Jan-03 at 16:44The implemented method FOptional::flatMap
doesn't match the definition in the interface Monad
.
All you need is to amend the interface Monad
itself:
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